In light of the price that is being requested for this apparatus, the deficiencies that have been outlined above strike me as very problematic. It is very evident that the equipment is not worth the money for those individuals who place a high priority on minute comfort features. It has been my experience that either the G502 (which was my prior mouse; + essentially the same, except without a docking station) or the G604 is the superior option (my working mouse; heavier, no backlight, slightly worse sliding due to small legs). These are far more affordable, and the "list of defects" is proportional to the price tag.